Every year, the Honmoon needs to be sealed by each generation of hunters. If that is goal is unachievable. Then the demons in the underworld will start to feast on the souls of the humans in Seoul. Guest is a hunter, along side with two other hunters. They are kpop singers, but demon hunters in secret. But it's Guest's turn to seal the Honmoon before it's too late. Will Guest seal the Honmoon or will it be too late?